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Deformation behaviour of syntactic iron - micro glass bubble foams

Deformationsverhalten von Schäumen aus syntaktischem Eisen und Mikroglasblasen
 
: Weise, J.; Silva, G.D.; Baumeister, J.; Bayoumi, M.A.

Stephani, G.; Hipke, T.; Scheffler, M.; Adler, J. ; Deutsche Gesellschaft für Materialkunde e.V. -DGM-, Oberursel; Fraunhofer-Institut für Fertigungstechnik und Angewandte Materialforschung -IFAM-, Dresden; Fraunhofer-Institut für Werkzeugmaschinen und Umformtechnik -IWU-, Chemnitz:
International Conference on Cellular Materials, CellMat 2010. Proceedings : Held in Dresden, Germany from 27-29 Oct 2010
Dresden, 2010
pp.389-394
International Conference on Cellular Materials (CellMat) <2010, Dresden>
English
Conference Paper
Fraunhofer IFAM ()

Abstract
The task for the present investigations was to find out in which way production parameters - especially the sintering time - have an influence on the ductility of syntactic foams. Potential mechanisms can be a modified interface bonding by changing the interface morphology, the internal glass structure (phase demixing was observed in FeNi(50)-specimens) and by diffusion based reactions between spheres and matrix alloy. From the presented results the following conclusions can be drawn: The influence of the sintering holding time (1.5h, 3h and 6h) upon the strength and plateau length is not significant. The length of the plateau regime increases with increasing content of myGB - in the range from 5 up to 10 % myGB the plateau yield strength is mostly independent of the glass bubble content. In future work the influence of the particle size of the iron powder upon the development of the shapes of the hollow spheres will be investigated. Furthermore, experiments are planned with matrix alloys which show a considerably reduced thermal expansion in comparison to iron which lets expect a reduced risk of crack formation during cooling from process to room temperature after sintering.

: http://publica.fraunhofer.de/documents/N-190072.html